import sys
input=sys.stdin.readline
n=int(input())
edge=[[]for _ in range(n)]
to=[0]*n
p=[0]*n
for _ in range(n-1):
  a,b=map(int,input().split())
  a-=1
  b-=1
  edge[a].append(b)
  to[b]=1
stack=[to.index(0)]
visited=set(stack)
mod=10**9+7
ans=0
for i in stack:
  for j in edge[i]:
    if j in visited:continue
    visited.add(j)
    stack.append(j)
    p[j]+=p[i]+1
  ans+=p[i]*(p[i]+1)//2
  ans%=mod
print(ans)